package org.example.thymeleaf.demo.demos.controller;

import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.xwpf.usermodel.BreakType;
import org.apache.poi.xwpf.usermodel.Document;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFPictureData;
import org.apache.xmlbeans.XmlOptions;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTBody;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author wzx
 * @date 2024/9/10 17:40
 * @description: word 合并
 */
@Controller
@RequestMapping("/merge")
public class MergeWordController {

    @GetMapping("/")
    public String mergeWord() throws Exception {
        File newFile = new File("D:/合并.docx");
        List<File> srcfile = new ArrayList<>();

        File file1 = new File("D:\\java-work-spase\\thymeleaf\\src\\main\\resources\\word\\1.docx");
        File file2 = new File("D:\\java-work-spase\\thymeleaf\\src\\main\\resources\\word\\2.docx");
        srcfile.add(file1);
        srcfile.add(file2);
        try {
            OutputStream dest = new FileOutputStream(newFile);
            ArrayList<XWPFDocument> documentList = new ArrayList<>();
            XWPFDocument doc = null;
            for (int i = 0; i < srcfile.size(); i++) {
                FileInputStream in = new FileInputStream(srcfile.get(i).getPath());
                OPCPackage open = OPCPackage.open(in);
                XWPFDocument document = new XWPFDocument(open);
                documentList.add(document);
            }
            for (int i = 0; i < documentList.size(); i++) {
                doc = documentList.get(0);
                if(i == 0){//首页直接分页，不再插入首页文档内容
                    documentList.get(i).createParagraph().createRun().addBreak(BreakType.PAGE);
//                    appendBody(doc,documentList.get(i));
                }else if(i == documentList.size()-1){//尾页不再分页，直接插入最后文档内容
                    appendBody(doc,documentList.get(i));
                }else{
                    documentList.get(i).createParagraph().createRun().addBreak(BreakType.PAGE);
                    appendBody(doc,documentList.get(i));
                }
            }
            doc.write(dest);
            dest.close();

            System.out.println("*****合成成功********");
            return "index";

            //      Runtime.getRuntime().exec("cmd /c start winword C:/Users/gouwe/合并.docx");//直接调用cmd打开合成文档
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "index";
    }



    public static void appendBody(XWPFDocument src, XWPFDocument append) throws Exception {
        CTBody destBody  = src.getDocument().getBody();
        CTBody srcBody  = append.getDocument().getBody();

        List<XWPFPictureData> allPictures = append.getAllPictures();
        // 记录图片合并前及合并后的ID
        Map<String,String> map = new HashMap<String,String>();
        for (XWPFPictureData picture : allPictures) {
            String before = append.getRelationId(picture);
            //将原文档中的图片加入到目标文档中
            String after = src.addPictureData(picture.getData(), Document.PICTURE_TYPE_PNG);
            map.put(before, after);
        }
        appendBody(destBody, srcBody ,map);
    }

    private static void appendBody(CTBody src, CTBody append,Map<String,String> map) throws Exception {
        XmlOptions optionsOuter = new XmlOptions();
        optionsOuter.setSaveOuter();
        String appendString = append.xmlText(optionsOuter);

        String srcString = src.xmlText();
        String prefix = srcString.substring(0,srcString.indexOf(">")+1);
        String mainPart = srcString.substring(srcString.indexOf(">")+1,srcString.lastIndexOf("<"));
        String sufix = srcString.substring( srcString.lastIndexOf("<") );
        String addPart = appendString.substring(appendString.indexOf(">") + 1, appendString.lastIndexOf("<"));
        if (map != null && !map.isEmpty()) {
            //对xml字符串中图片ID进行替换
            for (Map.Entry<String, String> set : map.entrySet()) {
                addPart = addPart.replace(set.getKey(), set.getValue());
            }
        }
        //将两个文档的xml内容进行拼接
        CTBody makeBody = CTBody.Factory.parse(prefix+mainPart+addPart+sufix);
        src.set(makeBody);
    }
}
